2 * linux/arch/ia64/kernel/irq.c
4 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
6 * This file contains the code used by various IRQ handling routines:
7 * asking for different IRQ's should be done through these routines
8 * instead of just grabbing them. Thus setups with different IRQ numbers
9 * shouldn't result in any weird surprises, and installing new handlers
14 * (mostly architecture independent, will move to kernel/irq.c in 2.5.)
16 * IRQs are in fact implemented a bit like signal handlers for the kernel.
17 * Naturally it's not a 1:1 relation, but there are similarities.
20 #include <linux/config.h>
21 #include <linux/ptrace.h>
22 #include <linux/errno.h>
23 #include <linux/signal.h>
24 #include <linux/sched.h>
25 #include <linux/ioport.h>
26 #include <linux/interrupt.h>
27 #include <linux/timex.h>
28 #include <linux/malloc.h>
29 #include <linux/random.h>
30 #include <linux/smp_lock.h>
31 #include <linux/init.h>
32 #include <linux/kernel_stat.h>
33 #include <linux/irq.h>
34 #include <linux/proc_fs.h>
38 #include <asm/system.h>
39 #include <asm/bitops.h>
40 #include <asm/uaccess.h>
41 #include <asm/pgalloc.h>
42 #include <asm/delay.h>
48 * Linux has a controller-independent x86 interrupt architecture.
49 * every controller has a 'controller-template', that is used
50 * by the main code to do the right thing. Each driver-visible
51 * interrupt source is transparently wired to the apropriate
52 * controller. Thus drivers need not be aware of the
53 * interrupt-controller.
55 * Various interrupt controllers we handle: 8259 PIC, SMP IO-APIC,
56 * PIIX4's internal 8259 PIC and SGI's Visual Workstation Cobalt (IO-)APIC.
57 * (IO-APICs assumed to be messaging to Pentium local-APICs)
59 * the code is designed to be easily extended with new/different
60 * interrupt controllers, without having to do assembly magic.
63 irq_cpustat_t irq_stat
[NR_CPUS
];
66 * Controller mappings for all interrupt sources:
68 irq_desc_t irq_desc
[NR_IRQS
] __cacheline_aligned
=
69 { [0 ... NR_IRQS
-1] = { IRQ_DISABLED
, &no_irq_type
, NULL
, 0, SPIN_LOCK_UNLOCKED
}};
71 static void register_irq_proc (unsigned int irq
);
74 * Special irq handlers.
77 void no_action(int cpl
, void *dev_id
, struct pt_regs
*regs
) { }
80 * Generic no controller code
83 static void enable_none(unsigned int irq
) { }
84 static unsigned int startup_none(unsigned int irq
) { return 0; }
85 static void disable_none(unsigned int irq
) { }
86 static void ack_none(unsigned int irq
)
89 * 'what should we do if we get a hw irq event on an illegal vector'.
90 * each architecture has to answer this themselves, it doesnt deserve
91 * a generic callback i think.
94 printk("unexpected IRQ trap at vector %02x\n", irq
);
95 #ifdef CONFIG_X86_LOCAL_APIC
97 * Currently unexpected vectors happen only on SMP and APIC.
98 * We _must_ ack these because every local APIC has only N
99 * irq slots per priority level, and a 'hanging, unacked' IRQ
100 * holds up an irq slot - in excessive cases (when multiple
101 * unexpected vectors occur) that might lock up the APIC
108 printk("Unexpected irq vector 0x%x on CPU %u!\n", irq
, smp_processor_id());
112 /* startup is the same as "enable", shutdown is same as "disable" */
113 #define shutdown_none disable_none
114 #define end_none enable_none
116 struct hw_interrupt_type no_irq_type
= {
126 volatile unsigned long irq_err_count
;
129 * Generic, controller-independent functions:
132 int get_irq_list(char *buf
)
135 struct irqaction
* action
;
138 p
+= sprintf(p
, " ");
139 for (j
=0; j
<smp_num_cpus
; j
++)
140 p
+= sprintf(p
, "CPU%d ",j
);
143 for (i
= 0 ; i
< NR_IRQS
; i
++) {
144 action
= irq_desc
[i
].action
;
147 p
+= sprintf(p
, "%3d: ",i
);
149 p
+= sprintf(p
, "%10u ", kstat_irqs(i
));
151 for (j
= 0; j
< smp_num_cpus
; j
++)
152 p
+= sprintf(p
, "%10u ",
153 kstat
.irqs
[cpu_logical_map(j
)][i
]);
155 p
+= sprintf(p
, " %14s", irq_desc
[i
].handler
->typename
);
156 p
+= sprintf(p
, " %s", action
->name
);
158 for (action
=action
->next
; action
; action
= action
->next
)
159 p
+= sprintf(p
, ", %s", action
->name
);
162 p
+= sprintf(p
, "NMI: ");
163 for (j
= 0; j
< smp_num_cpus
; j
++)
164 p
+= sprintf(p
, "%10u ",
165 nmi_counter(cpu_logical_map(j
)));
166 p
+= sprintf(p
, "\n");
167 #if defined(CONFIG_SMP) && defined(__i386__)
168 p
+= sprintf(p
, "LOC: ");
169 for (j
= 0; j
< smp_num_cpus
; j
++)
170 p
+= sprintf(p
, "%10u ",
171 apic_timer_irqs
[cpu_logical_map(j
)]);
172 p
+= sprintf(p
, "\n");
174 p
+= sprintf(p
, "ERR: %10lu\n", irq_err_count
);
180 * Global interrupt locks for SMP. Allow interrupts to come in on any
181 * CPU, yet make cli/sti act globally to protect critical regions..
185 unsigned int global_irq_holder
= NO_PROC_ID
;
186 volatile unsigned int global_irq_lock
;
188 extern void show_stack(unsigned long* esp
);
190 static void show(char * str
)
193 int cpu
= smp_processor_id();
195 printk("\n%s, CPU %d:\n", str
, cpu
);
196 printk("irq: %d [",irqs_running());
197 for(i
=0;i
< smp_num_cpus
;i
++)
198 printk(" %d",local_irq_count(i
));
199 printk(" ]\nbh: %d [",spin_is_locked(&global_bh_lock
) ? 1 : 0);
200 for(i
=0;i
< smp_num_cpus
;i
++)
201 printk(" %d",local_bh_count(i
));
203 printk(" ]\nStack dumps:");
204 #if defined(__ia64__)
206 * We can't unwind the stack of another CPU without access to
207 * the registers of that CPU. And sending an IPI when we're
208 * in a potentially wedged state doesn't sound like a smart
211 #elif defined(__i386__)
212 for(i
=0;i
< smp_num_cpus
;i
++) {
216 printk("\nCPU %d:",i
);
217 esp
= init_tss
[i
].esp0
;
219 /* tss->esp0 is set to NULL in cpu_init(),
220 * it's initialized when the cpu returns to user
223 printk(" <unknown> ");
226 esp
&= ~(THREAD_SIZE
-1);
227 esp
+= sizeof(struct task_struct
);
228 show_stack((void*)esp
);
233 printk("\nCPU %d:",cpu
);
238 #define MAXCOUNT 100000000
241 * I had a lockup scenario where a tight loop doing
242 * spin_unlock()/spin_lock() on CPU#1 was racing with
243 * spin_lock() on CPU#0. CPU#0 should have noticed spin_unlock(), but
244 * apparently the spin_unlock() information did not make it
245 * through to CPU#0 ... nasty, is this by design, do we have to limit
246 * 'memory update oscillation frequency' artificially like here?
248 * Such 'high frequency update' races can be avoided by careful design, but
249 * some of our major constructs like spinlocks use similar techniques,
250 * it would be nice to clarify this issue. Set this define to 0 if you
251 * want to check whether your system freezes. I suspect the delay done
252 * by SYNC_OTHER_CORES() is in correlation with 'snooping latency', but
253 * i thought that such things are guaranteed by design, since we use
256 #define SUSPECTED_CPU_OR_CHIPSET_BUG_WORKAROUND 0
258 #if SUSPECTED_CPU_OR_CHIPSET_BUG_WORKAROUND
259 # define SYNC_OTHER_CORES(x) udelay(x+1)
262 * We have to allow irqs to arrive between __sti and __cli
265 # define SYNC_OTHER_CORES(x) __asm__ __volatile__ ("nop 0")
267 # define SYNC_OTHER_CORES(x) __asm__ __volatile__ ("nop")
271 static inline void wait_on_irq(int cpu
)
273 int count
= MAXCOUNT
;
278 * Wait until all interrupts are gone. Wait
279 * for bottom half handlers unless we're
280 * already executing in one..
283 if (local_bh_count(cpu
) || !spin_is_locked(&global_bh_lock
))
286 /* Duh, we have to loop. Release the lock to avoid deadlocks */
287 clear_bit(0,&global_irq_lock
);
295 SYNC_OTHER_CORES(cpu
);
301 if (!local_bh_count(cpu
) && spin_is_locked(&global_bh_lock
))
303 if (!test_and_set_bit(0,&global_irq_lock
))
310 * This is called when we want to synchronize with
311 * interrupts. We may for example tell a device to
312 * stop sending interrupts: but to make sure there
313 * are no interrupts that are executing on another
314 * CPU we need to call this function.
316 void synchronize_irq(void)
318 if (irqs_running()) {
319 /* Stupid approach */
325 static inline void get_irqlock(int cpu
)
327 if (test_and_set_bit(0,&global_irq_lock
)) {
328 /* do we already hold the lock? */
329 if (cpu
== global_irq_holder
)
331 /* Uhhuh.. Somebody else got it. Wait.. */
334 } while (test_bit(0,&global_irq_lock
));
335 } while (test_and_set_bit(0,&global_irq_lock
));
338 * We also to make sure that nobody else is running
339 * in an interrupt context.
346 global_irq_holder
= cpu
;
349 #define EFLAGS_IF_SHIFT 9
352 * A global "cli()" while in an interrupt context
353 * turns into just a local cli(). Interrupts
354 * should use spinlocks for the (very unlikely)
355 * case that they ever want to protect against
358 * If we already have local interrupts disabled,
359 * this will not turn a local disable into a
360 * global one (problems with spinlocks: this makes
361 * save_flags+cli+sti usable inside a spinlock).
363 void __global_cli(void)
369 if (flags
& IA64_PSR_I
) {
370 int cpu
= smp_processor_id();
372 if (!local_irq_count(cpu
))
377 if (flags
& (1 << EFLAGS_IF_SHIFT
)) {
378 int cpu
= smp_processor_id();
380 if (!local_irq_count(cpu
))
386 void __global_sti(void)
388 int cpu
= smp_processor_id();
390 if (!local_irq_count(cpu
))
391 release_irqlock(cpu
);
396 * SMP flags value to restore to:
402 unsigned long __global_save_flags(void)
407 int cpu
= smp_processor_id();
411 local_enabled
= (flags
& IA64_PSR_I
) != 0;
413 local_enabled
= (flags
>> EFLAGS_IF_SHIFT
) & 1;
415 /* default to local */
416 retval
= 2 + local_enabled
;
418 /* check for global flags if we're not in an interrupt */
419 if (!local_irq_count(cpu
)) {
422 if (global_irq_holder
== cpu
)
428 void __global_restore_flags(unsigned long flags
)
444 printk("global_restore_flags: %08lx (%08lx)\n",
445 flags
, (&flags
)[-1]);
452 * This should really return information about whether
453 * we should do bottom half handling etc. Right now we
454 * end up _always_ checking the bottom half, which is a
455 * waste of time and is not what some drivers would
458 int handle_IRQ_event(unsigned int irq
, struct pt_regs
* regs
, struct irqaction
* action
)
461 int cpu
= smp_processor_id();
465 status
= 1; /* Force the "do bottom halves" bit */
467 if (!(action
->flags
& SA_INTERRUPT
))
471 status
|= action
->flags
;
472 action
->handler(irq
, action
->dev_id
, regs
);
473 action
= action
->next
;
475 if (status
& SA_SAMPLE_RANDOM
)
476 add_interrupt_randomness(irq
);
485 * Generic enable/disable code: this just calls
486 * down into the PIC-specific version for the actual
487 * hardware disable after having gotten the irq
490 void inline disable_irq_nosync(unsigned int irq
)
492 irq_desc_t
*desc
= irq_desc
+ irq
;
495 spin_lock_irqsave(&desc
->lock
, flags
);
496 if (!desc
->depth
++) {
497 desc
->status
|= IRQ_DISABLED
;
498 desc
->handler
->disable(irq
);
500 spin_unlock_irqrestore(&desc
->lock
, flags
);
504 * Synchronous version of the above, making sure the IRQ is
505 * no longer running on any other IRQ..
507 void disable_irq(unsigned int irq
)
509 disable_irq_nosync(irq
);
512 if (!local_irq_count(smp_processor_id())) {
515 } while (irq_desc
[irq
].status
& IRQ_INPROGRESS
);
520 void enable_irq(unsigned int irq
)
522 irq_desc_t
*desc
= irq_desc
+ irq
;
525 spin_lock_irqsave(&desc
->lock
, flags
);
526 switch (desc
->depth
) {
528 unsigned int status
= desc
->status
& ~IRQ_DISABLED
;
529 desc
->status
= status
;
530 if ((status
& (IRQ_PENDING
| IRQ_REPLAY
)) == IRQ_PENDING
) {
531 desc
->status
= status
| IRQ_REPLAY
;
532 hw_resend_irq(desc
->handler
,irq
);
534 desc
->handler
->enable(irq
);
541 printk("enable_irq() unbalanced from %p\n",
542 __builtin_return_address(0));
544 spin_unlock_irqrestore(&desc
->lock
, flags
);
548 * do_IRQ handles all normal device IRQ's (the special
549 * SMP cross-CPU interrupts have their own specific
552 unsigned int do_IRQ(unsigned long irq
, struct pt_regs
*regs
)
555 * We ack quickly, we don't want the irq controller
556 * thinking we're snobs just because some other CPU has
557 * disabled global interrupts (we have already done the
558 * INT_ACK cycles, it's too late to try to pretend to the
559 * controller that we aren't taking the interrupt).
561 * 0 return value means that this irq is already being
562 * handled by some other CPU. (or is disabled)
564 int cpu
= smp_processor_id();
565 irq_desc_t
*desc
= irq_desc
+ irq
;
566 struct irqaction
* action
;
569 kstat
.irqs
[cpu
][irq
]++;
570 spin_lock(&desc
->lock
);
571 desc
->handler
->ack(irq
);
573 REPLAY is when Linux resends an IRQ that was dropped earlier
574 WAITING is used by probe to mark irqs that are being tested
576 status
= desc
->status
& ~(IRQ_REPLAY
| IRQ_WAITING
);
577 status
|= IRQ_PENDING
; /* we _want_ to handle it */
580 * If the IRQ is disabled for whatever reason, we cannot
581 * use the action we have.
584 if (!(status
& (IRQ_DISABLED
| IRQ_INPROGRESS
))) {
585 action
= desc
->action
;
586 status
&= ~IRQ_PENDING
; /* we commit to handling */
587 if (!(status
& IRQ_PER_CPU
))
588 status
|= IRQ_INPROGRESS
; /* we are handling it */
590 desc
->status
= status
;
593 * If there is no IRQ handler or it was disabled, exit early.
594 * Since we set PENDING, if another processor is handling
595 * a different instance of this same irq, the other processor
596 * will take care of it.
602 * Edge triggered interrupts need to remember
604 * This applies to any hw interrupts that allow a second
605 * instance of the same irq to arrive while we are in do_IRQ
606 * or in the handler. But the code here only handles the _second_
607 * instance of the irq, not the third or fourth. So it is mostly
608 * useful for irq hardware that does not mask cleanly in an
612 spin_unlock(&desc
->lock
);
613 handle_IRQ_event(irq
, regs
, action
);
614 spin_lock(&desc
->lock
);
616 if (!(desc
->status
& IRQ_PENDING
))
618 desc
->status
&= ~IRQ_PENDING
;
620 desc
->status
&= ~IRQ_INPROGRESS
;
623 * The ->end() handler has to deal with interrupts which got
624 * disabled while the handler was running.
626 desc
->handler
->end(irq
);
627 spin_unlock(&desc
->lock
);
632 int request_irq(unsigned int irq
,
633 void (*handler
)(int, void *, struct pt_regs
*),
634 unsigned long irqflags
,
635 const char * devname
,
639 struct irqaction
* action
;
643 * Sanity-check: shared interrupts should REALLY pass in
644 * a real dev-ID, otherwise we'll have trouble later trying
645 * to figure out which interrupt is which (messes up the
646 * interrupt freeing logic etc).
648 if (irqflags
& SA_SHIRQ
) {
650 printk("Bad boy: %s (at 0x%x) called us without a dev_id!\n", devname
, (&irq
)[-1]);
659 action
= (struct irqaction
*)
660 kmalloc(sizeof(struct irqaction
), GFP_KERNEL
);
664 action
->handler
= handler
;
665 action
->flags
= irqflags
;
667 action
->name
= devname
;
669 action
->dev_id
= dev_id
;
671 retval
= setup_irq(irq
, action
);
677 void free_irq(unsigned int irq
, void *dev_id
)
680 struct irqaction
**p
;
686 desc
= irq_desc
+ irq
;
687 spin_lock_irqsave(&desc
->lock
,flags
);
690 struct irqaction
* action
= *p
;
692 struct irqaction
**pp
= p
;
694 if (action
->dev_id
!= dev_id
)
697 /* Found it - now remove it from the list of entries */
700 desc
->status
|= IRQ_DISABLED
;
701 desc
->handler
->shutdown(irq
);
703 spin_unlock_irqrestore(&desc
->lock
,flags
);
706 /* Wait to make sure it's not being used on another CPU */
707 while (desc
->status
& IRQ_INPROGRESS
)
713 printk("Trying to free free IRQ%d\n",irq
);
714 spin_unlock_irqrestore(&desc
->lock
,flags
);
720 * IRQ autodetection code..
722 * This depends on the fact that any interrupt that
723 * comes in on to an unassigned handler will get stuck
724 * with "IRQ_WAITING" cleared and the interrupt
727 unsigned long probe_irq_on(void)
735 * something may have generated an irq long ago and we want to
736 * flush such a longstanding irq before considering it as spurious.
738 for (i
= NR_IRQS
-1; i
> 0; i
--) {
741 spin_lock_irq(&desc
->lock
);
742 if (!irq_desc
[i
].action
)
743 irq_desc
[i
].handler
->startup(i
);
744 spin_unlock_irq(&desc
->lock
);
747 /* Wait for longstanding interrupts to trigger. */
748 for (delay
= jiffies
+ HZ
/50; time_after(delay
, jiffies
); )
749 /* about 20ms delay */ synchronize_irq();
752 * enable any unassigned irqs
753 * (we must startup again here because if a longstanding irq
754 * happened in the previous stage, it may have masked itself)
756 for (i
= NR_IRQS
-1; i
> 0; i
--) {
759 spin_lock_irq(&desc
->lock
);
761 desc
->status
|= IRQ_AUTODETECT
| IRQ_WAITING
;
762 if (desc
->handler
->startup(i
))
763 desc
->status
|= IRQ_PENDING
;
765 spin_unlock_irq(&desc
->lock
);
769 * Wait for spurious interrupts to trigger
771 for (delay
= jiffies
+ HZ
/10; time_after(delay
, jiffies
); )
772 /* about 100ms delay */ synchronize_irq();
775 * Now filter out any obviously spurious interrupts
778 for (i
= 0; i
< NR_IRQS
; i
++) {
779 irq_desc_t
*desc
= irq_desc
+ i
;
782 spin_lock_irq(&desc
->lock
);
783 status
= desc
->status
;
785 if (status
& IRQ_AUTODETECT
) {
786 /* It triggered already - consider it spurious. */
787 if (!(status
& IRQ_WAITING
)) {
788 desc
->status
= status
& ~IRQ_AUTODETECT
;
789 desc
->handler
->shutdown(i
);
794 spin_unlock_irq(&desc
->lock
);
801 * Return a mask of triggered interrupts (this
802 * can handle only legacy ISA interrupts).
804 unsigned int probe_irq_mask(unsigned long val
)
810 for (i
= 0; i
< 16; i
++) {
811 irq_desc_t
*desc
= irq_desc
+ i
;
814 spin_lock_irq(&desc
->lock
);
815 status
= desc
->status
;
817 if (status
& IRQ_AUTODETECT
) {
818 if (!(status
& IRQ_WAITING
))
821 desc
->status
= status
& ~IRQ_AUTODETECT
;
822 desc
->handler
->shutdown(i
);
824 spin_unlock_irq(&desc
->lock
);
831 * Return the one interrupt that triggered (this can
832 * handle any interrupt source)
834 int probe_irq_off(unsigned long val
)
836 int i
, irq_found
, nr_irqs
;
840 for (i
= 0; i
< NR_IRQS
; i
++) {
841 irq_desc_t
*desc
= irq_desc
+ i
;
844 spin_lock_irq(&desc
->lock
);
845 status
= desc
->status
;
847 if (status
& IRQ_AUTODETECT
) {
848 if (!(status
& IRQ_WAITING
)) {
853 desc
->status
= status
& ~IRQ_AUTODETECT
;
854 desc
->handler
->shutdown(i
);
856 spin_unlock_irq(&desc
->lock
);
860 irq_found
= -irq_found
;
864 /* this was setup_x86_irq but it seems pretty generic */
865 int setup_irq(unsigned int irq
, struct irqaction
* new)
869 struct irqaction
*old
, **p
;
870 irq_desc_t
*desc
= irq_desc
+ irq
;
873 * Some drivers like serial.c use request_irq() heavily,
874 * so we have to be careful not to interfere with a
877 if (new->flags
& SA_SAMPLE_RANDOM
) {
879 * This function might sleep, we want to call it first,
880 * outside of the atomic block.
881 * Yes, this might clear the entropy pool if the wrong
882 * driver is attempted to be loaded, without actually
883 * installing a new handler, but is this really a problem,
884 * only the sysadmin is able to do this.
886 rand_initialize_irq(irq
);
890 * The following block of code has to be executed atomically
892 spin_lock_irqsave(&desc
->lock
,flags
);
894 if ((old
= *p
) != NULL
) {
895 /* Can't share interrupts unless both agree to */
896 if (!(old
->flags
& new->flags
& SA_SHIRQ
)) {
897 spin_unlock_irqrestore(&desc
->lock
,flags
);
901 /* add new interrupt at end of irq queue */
913 desc
->status
&= ~IRQ_DISABLED
;
914 desc
->handler
->startup(irq
);
916 spin_unlock_irqrestore(&desc
->lock
,flags
);
918 register_irq_proc(irq
);
922 static struct proc_dir_entry
* root_irq_dir
;
923 static struct proc_dir_entry
* irq_dir
[NR_IRQS
];
924 static struct proc_dir_entry
* smp_affinity_entry
[NR_IRQS
];
926 static unsigned long irq_affinity
[NR_IRQS
] = { [0 ... NR_IRQS
-1] = ~0UL };
930 static int irq_affinity_read_proc (char *page
, char **start
, off_t off
,
931 int count
, int *eof
, void *data
)
933 if (count
< HEX_DIGITS
+1)
935 return sprintf (page
, "%08lx\n", irq_affinity
[(long)data
]);
938 static unsigned int parse_hex_value (const char *buffer
,
939 unsigned long count
, unsigned long *ret
)
941 unsigned char hexnum
[HEX_DIGITS
];
947 if (count
> HEX_DIGITS
)
949 if (copy_from_user(hexnum
, buffer
, count
))
953 * Parse the first 8 characters as a hex string, any non-hex char
954 * is end-of-string. '00e1', 'e1', '00E1', 'E1' are all the same.
958 for (i
= 0; i
< count
; i
++) {
959 unsigned int c
= hexnum
[i
];
962 case '0' ... '9': c
-= '0'; break;
963 case 'a' ... 'f': c
-= 'a'-10; break;
964 case 'A' ... 'F': c
-= 'A'-10; break;
968 value
= (value
<< 4) | c
;
975 static int irq_affinity_write_proc (struct file
*file
, const char *buffer
,
976 unsigned long count
, void *data
)
978 int irq
= (long) data
, full_count
= count
, err
;
979 unsigned long new_value
;
981 if (!irq_desc
[irq
].handler
->set_affinity
)
984 err
= parse_hex_value(buffer
, count
, &new_value
);
988 * Do not allow disabling IRQs completely - it's a too easy
989 * way to make the system unusable accidentally :-) At least
990 * one online CPU still has to be targeted.
992 if (!(new_value
& cpu_online_map
))
996 irq_affinity
[irq
] = new_value
;
997 irq_desc
[irq
].handler
->set_affinity(irq
, new_value
);
1002 static int prof_cpu_mask_read_proc (char *page
, char **start
, off_t off
,
1003 int count
, int *eof
, void *data
)
1005 unsigned long *mask
= (unsigned long *) data
;
1006 if (count
< HEX_DIGITS
+1)
1008 return sprintf (page
, "%08lx\n", *mask
);
1011 static int prof_cpu_mask_write_proc (struct file
*file
, const char *buffer
,
1012 unsigned long count
, void *data
)
1014 unsigned long *mask
= (unsigned long *) data
, full_count
= count
, err
;
1015 unsigned long new_value
;
1017 err
= parse_hex_value(buffer
, count
, &new_value
);
1025 #define MAX_NAMELEN 10
1027 static void register_irq_proc (unsigned int irq
)
1029 struct proc_dir_entry
*entry
;
1030 char name
[MAX_NAMELEN
];
1032 if (!root_irq_dir
|| (irq_desc
[irq
].handler
== &no_irq_type
))
1035 memset(name
, 0, MAX_NAMELEN
);
1036 sprintf(name
, "%d", irq
);
1038 /* create /proc/irq/1234 */
1039 irq_dir
[irq
] = proc_mkdir(name
, root_irq_dir
);
1041 /* create /proc/irq/1234/smp_affinity */
1042 entry
= create_proc_entry("smp_affinity", 0600, irq_dir
[irq
]);
1045 entry
->data
= (void *)(long)irq
;
1046 entry
->read_proc
= irq_affinity_read_proc
;
1047 entry
->write_proc
= irq_affinity_write_proc
;
1049 smp_affinity_entry
[irq
] = entry
;
1052 unsigned long prof_cpu_mask
= -1;
1054 void init_irq_proc (void)
1056 struct proc_dir_entry
*entry
;
1059 /* create /proc/irq */
1060 root_irq_dir
= proc_mkdir("irq", 0);
1062 /* create /proc/irq/prof_cpu_mask */
1063 entry
= create_proc_entry("prof_cpu_mask", 0600, root_irq_dir
);
1066 entry
->data
= (void *)&prof_cpu_mask
;
1067 entry
->read_proc
= prof_cpu_mask_read_proc
;
1068 entry
->write_proc
= prof_cpu_mask_write_proc
;
1071 * Create entries for all existing IRQs.
1073 for (i
= 0; i
< NR_IRQS
; i
++) {
1074 if (irq_desc
[i
].handler
== &no_irq_type
)
1076 register_irq_proc(i
);